ReadOnly columns on Tabular Forms (Javascript?)

I have a question in regaurds to tabular forms. I have a tabular form set up, working perfectly. However, I want to be able to make certain columns readonly upon adding the new row (clicking new row button).
Scenario:
1) Go to tabular form
2) Click add row
3) Once the new row apppears, the columns should all be read only columns (i.e. cant type in them)
4) Exception: There is one column, a select list, that shouldn't be readonly.
5) Depending on which value is selected from the select list, determines which columns will be editable, or un-read-only.
- The last step is merely a conditional. The part that is plaguing me is accessing the actual columns of the tabular form. I'm not too sure how to go about this. Would I even have to make changes to the actual AddRow() function itsself?
Thanks for any help in advance
sincerely, #StillLearningApexGuy

wOW,..this example works perfectly. My javascript/jquery is a little rusty but I should be able to tweak the example for my needs.
Thanks for the example. I am in your debt
Sincerely #GreatfulApexGuy

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